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There are 3 kinds of inputs in our Ethernet PLCs: Digital Optoisolated, Digital Non-Optoisolated and Analog.

-The digital optoisolated as its name says, it is optoisolated. This means that the grounds don't have to match to have the same reference. This is ideal to connect digital sensors or in general digital signals from another device. This signal is detected as high from 5V to 24Vdc

-The digital non-optoisolated are found in the same place as the analog inputs. If this digital signal comes from an external device, now it must have common grounds or it won't work. This signal is detected as high from 5V to 24Vdc

-The analog inputs are found in the same place as the digital non-optoisolated inputs. If this signal comes from an external device, now it must have common grounds or it won't work. This signal works from 0 to 10V.

The inputs are enabled by default. There are some exception for the IX.5, IX.6 pins (it would be I0.5, I0.6, I1.5, I1.6, I2.5 & I2.6). These ones are configured by the switches which are found in the bottom shield. These switches let you choose between a communication protocol or these inputs.

The way to differenciate between digital or analog inputs is through the software. If you use the AnalogRead() function you will be treating that input as analog. If you use the DigitalRead() you will be treating that input as digital.

The last thing is how to name the inputs when using our boards. The nomenclature is IX_X, being X any value available in the PLC. i.e. I0_5, I1_12, 12_0

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Based in Barcelona and founded in October 2012, Industrial Shields is the brand under the company Boot and Work Corp S.L. We are a company with the aim to become the biggest e-commerce of industrial automation electronic devices based on Open Source Hardware electronics. Our goal is to offer the widest choice of products at a very reasonable costs compared with the products that are developed under the current market leaders.